SiBE04-101 General FunctionsMain Function 351.14 Input Current ControlOutline The frequency control will be carried out so that the input current will not exceed the rated value in the zonewhich is divided by the input current detected with CT as the figure below shows. I4, I3, I3-Iα are included in the stop zone, step down, steady zone, respectively.Details of theControl1. Frequency control in each zone Step down zone (judged as the step down zone with the input current I IN ≥ I3) The upper limit FNYD of the frequency in this control is defined as ‘operation frequency - 2 Hz’. After this, the output frequency is dealt with step down by 2 Hz every one second till it will reach thesteady zone. Steady zone (judged as the step down zone with I3 - Iα ≤ I IN < I3 by step down operation) Keeping the present frequency’s upper limit FNYD. Return zone (judged as the return zone with I IN < I3 - Iα) (Iα = 1A) Limit of frequency is cancelled. Stop zone (judged as the stop zone with I IN ≥ I4) Compressor is stopped and countermeasure for the malfunction is carried out.2. Current step down : deciding I3 In cooling mode At outdoor temperature > DOAIC At outdoor temperature ≤ DOAIC In heating mode At outdoor temperature > DOAIW At outdoor temperature ≤ DOAIWC : Cooling PWF : Powerful W : HeatingInput current detected with CT: I INCompressor stops.I3 - IαI3I4Return zoneSteady zoneStep down zoneStop zoneI4 = 18.5AIα = 1A(R1040)I3 = I3C - 0.75 × (outdoor temp. DOAIC) ∗ At POWER FULL, both I3C and I3CPWF are used.I3 = I3C ∗ At POWER FULL, both I3C and I3CPWF are used.I3 = I3W - 0.25 × (outdoor temp. - DOAIW) ∗ At POWER FULL, both I3W and I3WPWF are used.I3 = I3W ∗ At POWER FULL, both I3W and I3WPWF are used.(a constant) 50 Class 60 Class 71 ClassI3C 10.50 A 12.50 A 15.25 AI3CPWF 10.50 A 12.50 A 15.25 ADOAIC 40.0˚C 37.5˚C 35.5˚CI3W 17.50 A 17.50 A 17.50 AI3WPWF 17.75 A 17.75 A 17.75 ADOAIW 12˚C 12˚C 12˚CSiBE04-101.book Page 35 Monday, October 15, 2001 3:08 PM
